Effect of heat shock protein peptide DiaPep277 on β-cell function in paediatric and adult patients with recent-onset diabetes mellitus type 1: Two prospective, randomized, double-blind phase II trials

Nanette C. Schloot, Guido Meierhoff, Csaba Lengyel, Gyözö Vándorfi, József Takács, Pál Pánczél, László Barkai, László Madácsy, Tamás Oroszlán, Peter Kovács, Gábor Sütö, Tadej Battelino, Nora Hosszufalusi, György Jermendy

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Background: Aim of this trial was to test whether heat shock protein peptide DiaPep277 treatment in adult and paediatric patients with recent-onset type 1 diabetes (T1D) is safe and whether it can preserve endogenous insulin production. Methods: Two studies were performed in a prospective, multicentre, double-blind, placebo-controlled trial. Fifty adult (study p520, aged 16-44 years) and 49 paediatric patients (study p521, 4-15 years) with recent-onset T1D were treated subcutaneously at four different time points with 0.2 mg or 1.0 mg DiaPep277 versus placebo and followed for 18 months. Adult patients were treated with 0.2 mg, 1.0 mg or 2.5 mg DiaPep277 versus placebo. Stimulated C-peptide served as readout for functional β-cell-mass. Results: DiaPep277-treatment was not associated with severe side effects. No differences were found in placebo and DiaPep277 treated groups. In adults, a modest trend towards better maintenance of β-cell function was observed in the 0.2 mg and 1.0 mg group, while there was significant loss of stimulated C-peptide in the placebo and 2.5 mg group. Paediatric patients with low HLA risk showed stable C-peptide levels until 13 months upon treatment with 1 mg DiaPep277. Despite similar stimulated C-peptide levels at baseline, children exhibited a more pronounced loss of β-cell function over 18 months than adults (p = 0.0003). Conclusion: Administration of DiaPep277 seems safe and may have beneficial effects on C-peptide levels over time in some patients with T1D, but this finding was not accompanied by reduced HbA1c or insulin requirement. Studies with more patients and longer follow-up are needed to further study the effect of DiaPep277.

Original languageEnglish
Pages (from-to)276-285
Number of pages10
JournalDiabetes/Metabolism Research and Reviews
Issue number4
Publication statusPublished - May 1 2007



  • C-peptide
  • HbA
  • Hsp60
  • Human trials
  • Insulin
  • Prevention
  • Type 1 diabetes mellitus

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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